Audio-Technica Wireless Microphones and Transmitters (ATWT310C) The versatile ATW-T310b UniPak body-pack transmitter features a secure 4-pin locking connector compatible with a wide range of microphones, as well as a guitar cable. A 3-position sliding cover on the transmitters control panel prevents accidental shut-off or channel-switching. A new locking battery compartment provides a more secure latch and more robust design. Features: Backlit LCD & dual-color LED Locking battery compartment with secure latch and robust design Ground-lift switch helps eliminate audible hum caused by ground loops Balanced and unbalanced audio output jacks ATW-T310c UniPak transmitter includes Super Hi-Z input that provides optimum load for guitar pickups